21 решите неравенство. Created by neakw. algebra-ru

21 решите неравенство...

neakw @neakw

October 2021 1 19 Report

21 решите неравенство

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m11m

Verified answer

X² - 4x -21 >0
x² -4x -21=0
D=16+84=100
x₁=(4-10)/2=-3
x₂=(4+10)/2=7
+ - +
--------- -3 ------------- 7 ------------
\\\\\\\\\\ \\\\\\\\\\\\\\

x∈(-∞; -3)U(7; +∞)

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